Steel and Composite Structures

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Experimental and finite element analyses of eccentric compression of basalt-fiber reinforced recycled aggregate concrete-filled circular steel tubular stub column

  • Zhang, Xianggang (School of Intelligent Construction, Wuchang University of Technology) ;
  • Zhang, Songpeng (School of Civil Engineering, Henan Polytechnic University) ;
  • Yang, Junna (School of Civil Engineering, Henan Polytechnic University) ;
  • Chen, Xu (School of Civil Engineering, Henan Polytechnic University) ;
  • Zhou, Gaoqiang (School of Civil Engineering, Henan Polytechnic University)
  • Received : 2021.09.02
  • Accepted : 2022.02.12
  • Published : 2022.03.10
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Abstract

To study the eccentric compressive performance of the basalt-fiber reinforced recycled aggregate concrete (BFRRAC)-filled circular steel tubular stub column, 8 specimens with different replacement ratios of recycled coarse aggregate (RCA), basalt fiber (BF) dosage, strength grade of recycled aggregate concrete (RAC) and eccentricity were tested under eccentric static loading. The failure mode of the specimens was observed, and the relationship curves during the entire loading process were obtained. Further, the load-lateral displacement curve was simulated and verified. The influence of the different parameters on the peak bearing capacity of the specimens was analyzed, and the finite element analysis model was established under eccentric compression. Further, the design-calculation method of the eccentric bearing capacity for the specimens was suggested. It was observed that the strength failure is the ultimate point during the eccentric compression of the BFRRAC-filled circular steel tubular stub column. The shape of the load-lateral deflection curves of all specimens was similar. After the peak load was reached, the lateral deflection in the column was rapidly increased. The peak bearing capacity decreased on enhancing the replacement ratio or eccentric distance, while the core RAC strength exhibited the opposite behavior. The ultimate bearing capacity of the BFRRAC-filled circular steel tubular stub column under eccentric compression calculated based on the limit analysis theory was in good agreement with the experimental values. Further, the finite element model of the eccentric compression of the BFRRAC-filled circular steel tubular stub column could effectively analyze the eccentric mechanical properties.

Keywords

Acknowledgement

This work was financially supported by the Fundamental Research Funds for the Universities of Henan Province (NSFRF200320), Key R&D and Promotion Projects in Henan Province (212102310288), National Natural Science Foundation of China (U1904188).

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